On the positive side, this means that Firefox Sync is working to synchronize settings/data between your browsers. But on the minus side, that may not be what you want for personal versus work scenarios. So what can we do about that... '''Scenario One: Sync some types of data, but not others''' If you want Firefox to share bookmarks between personal and work, but NOT other kinds of data like history and settings, you can manage that using the Sync settings. The following article describes how to turn different categories on and off: [[How do I choose what information to sync on Firefox?]] '''Scenario Two: Sync as much as possible, with selective exceptions''' If you want the two Firefoxes to be as similar as possible with just a couple exceptions, then we have to tell you about where to enter those exceptions. See the steps below the line. '''Scenario Three: Break the connection, don't Sync anything''' In this case, you need to sign one of your installations of Firefox out of your Mozilla account. You can create a second Mozilla account to keep the data from that installation of Firefox separate, using a free email address from Microsoft, Google, etc. ---- Here are two settings you might not want to sync, and how to stop sync'ing them. Please ask here on the support forum about other settings, since the names are not always this obvious. (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' ''Home page'' (2) In the search box in the page, type or paste '''sync*home''' and pause while the list is filtered. Firefox should show a single match. (3) Double-click the '''services.sync.prefs.sync.browser.startup.homepage''' preference to switch the value from true to false. Now, even if you are sync'ing preferences, this particular one won't sync on this Firefox. Please repeat on your other Firefox. ''Toolbar theme'' (4) In the search box in the page, type or paste '''sync*theme''' and pause while the list is filtered. Firefox should show a single match. (5) Double-click the '''services.sync.prefs.sync.extensions.activeThemeID''' preference to switch the value from true to false. Now, even if you are sync'ing preferences, this particular one won't sync on this Firefox. Please repeat on your other Firefox. Now you can use different toolbar themes without affecting your other installation. ([[Use themes to change the look of Firefox]]) Success?